Cryosphere carbon dynamics control early Toarcian global warming and sea level evolution

  title={Cryosphere carbon dynamics control early Toarcian global warming and sea level evolution},
  author={Wolfgang Ruebsam and Bernhard Mayer and Lorenz Schwark},
  journal={Global and Planetary Change},

Impact of a northern-hemispherical cryosphere on late Pliensbachian–early Toarcian climate and environment evolution

Abstract The historical view of an equable Jurassic greenhouse world has been challenged by recent studies documenting recurrent alternation between contrasting climate modes. Cooling of

δ13C of terrestrial vegetation records Toarcian CO2 and climate gradients

Stable carbon isotopes (δ13C) of molecular land plant fossils complemented by bulk organic and inorganic carbon fractions for early Toarcian (Early Jurassic) sediments that coincided with global warming and a carbon cycle perturbation are reported.

Direct coupling between carbon release and weathering during the Toarcian oceanic anoxic event

Silicate weathering represents a major feedback mechanism in the Earth’s climate system, helping to stabilize atmospheric CO2 levels and temperature on million-year time scales. On shorter time

Rapid light carbon releases and increased aridity linked to Karoo–Ferrar magmatism during the early Toarcian oceanic anoxic event

Large-scale release of isotopically light carbon is responsible for the carbon isotope excursion (CIE) of the Toarcian Oceanic Anoxic Event during the Lower Jurassic. Proposed sources include methane

Assessing the importance of thermogenic degassing from the Karoo Large Igneous Province (LIP) in driving Toarcian carbon cycle perturbations

The effects of pulsed carbon release from the Karoo LIP on atmospheric pCO2 and δ13C of marine sediments are explored, using the GEOCLIM carbon cycle model and it is shown that a total of 20,500 Gt C replicates the Toarcian pCO 2 and ε13C proxy data, and that thermogenic carbon represents a plausible source for the observed negative CIEs.

The Toarcian Oceanic Anoxic Event: where do we stand?

Abstract The study of past climate changes is pivotal for understanding the complex biogeochemical interactions through time between the geosphere, atmosphere, hydrosphere and biosphere, which are



Past extreme warming events linked to massive carbon release from thawing permafrost

Between about 55.5 and 52 million years ago, Earth experienced a series of sudden and extreme global warming events (hyperthermals) superimposed on a long-term warming trend. The first and largest of

Glendonites track methane seepage in Mesozoic polar seas

During the Phanerozoic, Earth has experienced a number of transient global warming events associated with major carbon cycle perturbations. Paradoxically, many of these extreme greenhouse episodes

Polar record of Early Jurassic massive carbon injection

Carbon sequestration in an expanded lake system during the Toarcian oceanic anoxic event

The Early Jurassic Toarcian oceanic anoxic event (~183 Ma) was marked by marine anoxia–euxinia and globally significant organic-matter burial, accompanied by a major global carbon-cycle perturbation

Evidence for rapid weathering response to climatic warming during the Toarcian Oceanic Anoxic Event

The enhanced weathering modulated by initially increased pCO2 levels would have operated as both a direct and indirect negative feedback to end the Toarcian Oceanic Anoxic Event from an open ocean sedimentary succession from western North America.

Permafrost carbon-climate feedbacks accelerate global warming

A terrestrial ecosystem model that includespermafrost carbon dynamics, inhibition of respiration in frozen soil layers, vertical mixing of soil carbon from surface to permafrost layers, and CH4 emissions from flooded areas is used, to explore the potential for carbon-climate feedbacks at high latitudes.

Black shale deposition during Toarcian super-greenhouse driven by sea level

Abstract. One of the most elusive aspects of the Toarcian oceanic anoxic event (T-OAE) is the paradox between carbon isotopes that indicate intense global primary productivity and organic carbon

Changes in carbon dioxide during an oceanic anoxic event linked to intrusion into Gondwana coals

The carbon dioxide record better supports a magma-intrusion hypothesis, and suggests that injection of isotopically light carbon from the release of thermogenic methane occurred owing to the intrusion of Gondwana coals by Toarcian-aged Karoo-Ferrar dolerites.

Modeling evidences for global warming, Arctic seawater freshening, and sluggish oceanic circulation during the Early Toarcian anoxic event

[1] The paleoecological disturbances recorded during the Early Toarcian warming event (183 Myr ago), including marine anoxia, sea level rise, seawater acidification, carbonate production crisis, and